I just downloaded the 4.14 version of the project and packaged it, deployed it to my desktop and laptop, and tested it in both Steam and LAN. It works. I didn't change anything with the project. If yours doesn't work, I cannot tell you why. Attached are screenshots showing my results of the tests. (These tests were conducted on the same LAN network with the server being wired to a switch connected directly to a router and the client being wireless connected to a wireless access point.)

Well, thank you, because I am the engine compiled with the source code. I can not search it by packing it, and you can search it with a compiled engine.